title: Second-harmonic generation from Langmuir-Blodgett film of cyclic peptide carrying two disperse red 1 on fused quartz surface.
abstract: Cyclic octapeptide carrying one or two nonlinear optical chromophores, disperse red 1 (DR-1), was synthesized and immobilized on a substrate to attain an active surface for second-harmonic generation (SHG). Each cyclic octapeptide was transferred on a fused quartz substrate by the Langmuir-Blodgett (LB) method to afford a uniform monolayer. Infrared reflection-absorption spectroscopy of the LB monolayer revealed that the cyclic skeleton lay roughly flat on the surface. The SHG intensity from the monolayer of the cyclic peptide with two DR-1 units was stronger than that from that with one DR-1 unit. The difference is discussed in terms of molecular orientation and surface density of the active chromophores. The cyclic peptide is shown here to be an effective scaffold to modify a substrate surface with functional groups of a monolayer with taking stability of the monolayer and orientation of the functional group into consideration.
authors.affiliation: Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto, Japan.
authors.forename: Shigekatsu
authors.initials: S
authors.lastname: Fujii
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Morita
authors.forename: Shunsasku
authors.initials: S
authors.lastname: Kimura
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D015394:Molecular Structure; D010456:Peptides, Cyclic / Q000138:chemical synthesis* / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001391:Azo Compounds; D010456:Peptides, Cyclic; C069318:Disperse Red 1